<!DOCTYPE HTML>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<html><head>
  <meta charset="utf-8">
  <title>CSS Grid Test: Masonry layout with a subgrid</title>
  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
  <link rel="help" href="https://drafts.csswg.org/css-grid-3/#subgrids">
  <link rel="match" href="masonry-subgrid-002-ref.html">
<style>
html,body {
  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
}

grid {
  display: inline-grid;
  grid-template-rows: 40px 30px 20px;
  grid-template-columns: masonry;
  gap: 4px 2px;
  padding: 1px 3px 5px 7px;
  border: solid;
  border-width: 3px 5px 1px 1px;
  background: lightgrey content-box;
}
.rows {
  grid-template-columns: 40px 30px 20px;
  grid-template-rows: masonry;
}
item {
  background: grey;
  width: 3ch;
  position: relative;
}
item:nth-child(2n) { background:purple; width:auto; }
item:nth-child(1) {
  border: solid;
  border-width: 3px 5px 1px 1px;
  margin: 7px 1px 5px 3px;
}
subgrid {
  display: grid;
  grid-row: auto/span 2;
  grid-column: auto/span 2;
  grid: subgrid / subgrid;
  grid-gap: 6px 8px;
  background: yellow;
}
subgrid.definite {
  grid-row-start:2;
}
subgrid.extent {
  grid-row: auto/span 3;
}
.rows > subgrid.definite {
  grid-column-start:2;
}
.rows > subgrid.extent {
  grid-row: auto/span 2;
  grid-column: auto/span 3;
}
</style>
</head>
<body>

<!-- auto-placed subgrid inhibits subgridding when parent is doing masonry layout ... -->
<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid>
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- ... unless it's auto-placed in the first track ... -->
<grid>
  <item>1</item>
  <subgrid>
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>2</item>
  <item>3</item>
  <item>5</item>
</grid>

<!-- ... or has definite start position -->
<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid class="definite">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- ... or span all tracks in the grid-axis -->
<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid class="extent">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- auto-placed subgrid inhibits subgridding when parent is doing masonry layout ... -->
<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid style="grid: subgrid / masonry">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- ... unless it's auto-placed in the first track ... -->
<grid>
  <item>1</item>
  <subgrid style="grid: subgrid / masonry">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>2</item>
  <item>3</item>
  <item>5</item>
</grid>

<!-- ... or has definite start position -->
<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid class="definite">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- ... or span all tracks in the grid-axis -->
<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid class="extent">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- auto-placed subgrid "inherits" masonry if it has a grid-axis of its own -->
<grid>
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid style="grid: auto auto / subgrid">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- auto-placed subgrid inhibits subgridding when parent is doing masonry layout ... -->
<grid class="rows">
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid>
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- ... unless it's auto-placed in the first track ... -->
<grid class="rows">
  <item>1</item>
  <subgrid>
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>2</item>
  <item>3</item>
  <item>5</item>
</grid>

<!-- ... or has definite start position -->
<grid class="rows">
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid class="definite">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- ... or span all tracks in the grid-axis -->
<grid class="rows">
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid class="extent">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- auto-placed subgrid inhibits subgridding when parent is doing masonry layout -->
<grid class="rows">
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid style="grid: masonry / subgrid">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- ... unless it's auto-placed in the first track ... -->
<grid class="rows">
  <item>1</item>
  <subgrid style="grid: masonry / subgrid">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>2</item>
  <item>3</item>
  <item>5</item>
</grid>

<!-- ... or has definite start position -->
<grid class="rows">
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid class="definite">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- ... or span all tracks in the grid-axis -->
<grid class="rows">
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid class="extent">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

<!-- auto-placed subgrid "inherits" masonry if it has a grid-axis of its own -->
<grid class="rows">
  <item>1</item>
  <item>2</item>
  <item>3</item>
  <subgrid style="grid: subgrid / auto auto">
    <item>4a</item>
    <item>4b</item>
    <item>4c</item>
  </subgrid>
  <item>5</item>
</grid>

</body></html>
